How do I plan a successful set of travel photographs?You might find this book useful: Travel Photography: A Guide to Taking Better Pictures (Lonely Planet How to Guides) by Richard l'Anson. It covers technique, which you may not want or need, but also has many tips about travel photography logistics.

In food photography (using a nifty fifty lens) how can I make my food shot more in focus and not blurry?Nice shot. In my opinion you should stick the focus on the garnish on the front plate - it appears to be on the frontmost piece of multicoloured fabric. Then experiment with stopping down as others have mentioned. I'm no food or product photographer but I find with wildlife, if I have the point of maximum focus exactly on the creature's eye, I can get away with a shallower depth of field than you'd expect. Also, if you're using a tripod, use live view with maximum magnification to get your focus exactly where you want it.

Oct30

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Printing large (16x20 and up) with the Olympus OM-D EM-5?16MP will give you about 225 pixels per inch for a 16 x 20 print - that's usually considered enough for normal viewing distances. The G2 was giving you ~195 PPI for the same size image - normally that would be just enough, too. Are you sure that lens wasn't letting down the G2? Did you try it stopped down quite a bit to test it?